Binding to Children.Count

Question

I\'m using a binding of the form

{Binding RelativeSource={RelativeSource Self}, Path=Children.Count, Converter={StaticResource CountToDimensionConverter}, C         


        

Answer 1

public class GridEx : Grid, INotifyPropertyChanged
{
    public delegate void ChildrenUpdatedEventHandler(DependencyObject visualAdded, DependencyObject visualRemoved);

    public event ChildrenUpdatedEventHandler ChildrenUpdated;
    public event PropertyChangedEventHandler PropertyChanged;

    public bool HasChildren => Children.Cast().Where(element => element != null).Count() > 0;
    public int ChildCount => Children.Cast().Where(element => element != null).Count();

    protected override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved)
    {
        base.OnVisualChildrenChanged(visualAdded, visualRemoved);

        ChildrenUpdated?.Invoke(visualAdded, visualRemoved);
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(HasChildren)));
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ChildCount)));
    }
}

Use property ChildCount instead.